avinash:
You can upgrade via Unbreakable Linux Network (ULN) if you are a Linux support customer.
* Subscribe to EL5 Latest channel
* up2date -u
If you're not a Linux support customer, look into public-yum.oracle.com and use the OEL forum:
http://forums.oracle.com/forums/forum.jspa?forumID=822
Sergio

Vidyesh,
There is no FTP site. Please report your findings in the Downloads forum. Be very detailed in the description of your problem.
* What are you downloading?
* Where are you downloading from?
* What, if any, download manager do you use?
* What error messages do you see?
http://forums.oracle.com/forums/forum.jspa?forumID=36&start=0
Sergio